gccgo on sparc

[Maciej Bliziński]

2011/8/22 Ian Lance Taylor <iant@google.com>:
> Maciej Bliziński <maciej@opencsw.org> writes:
>
>> type Iovec_len_t int32
>>   type Iovec struct { Base _caddr_t; Len Iovec_len_t; }
>>   type Msghdr_controllen_t
>>   type Msghdr struct { Name *byte; Namelen uint32; Iov *Iovec; Iovlen
>> int32; msg_accrights _caddr_t; msg_accrightslen int32; }
>>
>> The first observation is that on sparc there's nothing after the
>> Msghdr_controllen_t.  Does anyone have an advice where to look to make
>> it build?
>
> Which version of gcc are you building?  Best to stick with mainline for
> this.

I started with the gcc-4.6.1 tarball.

> If you are using mainline, then what does the definition of "struct
> msghdr" look like in <sys/socket.h> (it may be defined in some header
> file #included by <sys/socket.h>)?

maciej@unstable9s :~/src/opencsw/pkg/gcc4/branches/gccgo > ggrep -A14
"struct msghdr {" /usr/include/sys/socket.h
struct msghdr {
        void            *msg_name;              /* optional address */
        socklen_t       msg_namelen;            /* size of address */
        struct iovec    *msg_iov;               /* scatter/gather array */
        int             msg_iovlen;             /* # elements in msg_iov */

#if defined(_XPG4_2) || defined(_KERNEL)
        void            *msg_control;           /* ancillary data */
        socklen_t       msg_controllen;         /* ancillary data buffer len */
        int             msg_flags;              /* flags on received message */
#else
        caddr_t         msg_accrights;  /* access rights sent/received */
        int             msg_accrightslen;
#endif  /* defined(_XPG4_2) || defined(_KERNEL) */
};

> Also, look for "type _msghdr" in gen-sysinfo.go.  What does the type
> look like?

Splitting into multi-line:

type _msghdr struct {
msg_name *byte;
msg_namelen uint32;
msg_iov *_iovec;
msg_iovlen int32;
msg_accrights _caddr_t;
msg_accrightslen int32;
}

> The definition of Msghdr_controllen_t is generated by the shell script
> mksysinfo.sh.  Something is going wrong there.

Looking at mksysinfo.sh, the first thing I noticed is the use of the
"if ! ...; then ..; fi" construct together with "#!/bin/sh". On
Solaris, /bin/sh does not support the "if ! ..." syntax. You need to
say "if ...; then nothing; else ...; fi".

#!/bin/sh

# Invalid
if ! false; then
  echo "Test 1"
fi

# Valid
if false; then
  echo -n # nothing
else
  echo "Test 2"
fi

The other option is to use a different shell.

What's the exact problem with Msghdr_controllen_t I don't know yet, I
will look at the shell script more closely and reply again.

Maciej